California’s drastic drought has me
thinking about the way I use water in my ornamental garden in Massachusetts. Someday
I may be forced to change my profligate ways. I’m starting to think sooner
would be better than later.
My
earliest gardens were small enough to water with a big watering can or a hose
and watering wand. When I cultivated more ground, I switched to rotating
sprinklers.
The biggest negative to that approach was the operator—me. I hate
to think how many hundreds of gallons I wasted by forgetting the sprinkler was
running.
Finally my garden got so big that I moved up to an automatic sprinkler
irrigation system controlled by a computer in the basement. The computer doesn’t
forget to turn the water off. It’s
programmed to start watering at 3 AM, when the air is cool, but some of the
water still evaporates. In retrospect, drip irrigation would have been a more
water-saving approach for trees, shrubs, and perennial beds.
The
sprinkler irrigation system uses a lot of water. Comparing water bills before
and after we installed it brought me up sharp. I’d tripled our household’s
summer water use. I started paring down the water allotted to each irrigation
zone, especially the lawn areas, letting the grass turn brown in August.
We
in the eastern US have skewed assumptions about water availability. We’re used
to thinking of water as cheap and unlimited, almost like air. That's because the twentieth century was one of our wettest on record. In the future we
may be forced to manage with a limited water supply. Using drinking water to irrigate
an ornamental garden like mine may become prohibitively expensive or just impossible.
I
wish I’d planted with water conservation in mind, grouping thirsty plants
together. Since I didn’t, I’m working on paying more attention to which plants
really need supplemental watering. A rain gauge attached to the irrigation
system is supposed to prevent automatic watering when rainfall is sufficient. I’d
been relying on that and a fixed watering schedule to determine how much water
each zone gets every week in the growing season. Established trees and shrubs
may not need any extra water, whereas my vegetable garden, annual flowers, and
newly planted shrubs and perennials do need regular watering.
My plan is to
poke a finger in the soil periodically, find out whether it’s actually dry, and see
whether plants are drooping. This should allow me to devise a less wasteful
watering schedule.
To
this, residents of the Southwest probably say, “Duh!” I’ll catch up eventually.
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